Предмет: Математика, автор: ДьЯвОлИцА222

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Автор ответа: Вика122003

$\frac{cos^{2}x-sin^{2}x }{1-2sin^{2}x } = \frac{1-sin^{2}x-sin^{2}x}{1-2sin^{2}x} = \frac{1-2sin^{2}x}{1-2sin^{2}x} = 1$

использовалась формула $cos^{2}x+sin^{2}x=1$

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So, you are students of South-Russia State
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